It keeps ejecting the DVD

Hello sir/madam, I had the same trouble with a pioneer dvd, the disk keeps on ejecting all the time. the problem usually is caused by poor design on their deck mechanism. dirt and dust enters your lens mechanism and accumulates as time goes on. you may improve it by dismanteling it and you need to reach the lens mechanism. spray it with contact cleaners the joints which hold the lens, dont spray the on the lens. then reassemble it test. if you have any more questions feel free to ask. thanks